Unfortunately, there's no "quick" way yet. This is a feature I'll have to implement ASAP. In the meantime, you'll have to remove the expressions in the controllers in the precomposition, but only the expressions used for linking them (not the ones used to compute the IK for example). It's pretty eas...

You can also animate outside of the comp using the "extract controllers" tool, and checking the Continuously rasterize/collapse transformations option on the precomp, so you'll get what's outside of the precomp and you won't have to resize it